# Airworthiness Directives; Boeing Model 727 Airplanes, Equipped With an Auxiliary Fuel Tank Having a Fuel Pump Installed
> **Rule** · Final rule. · Published 2005-06-30 · Effective 2005-08-04 · 70 FR 37659
## Document
- **Document number:** 05-12844
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 727
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 37659
- **Publication date:** 2005-06-30
- **Effective date:** 2005-08-04
- **FAA docket:** Docket No. FAA-2005-20355
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Boeing Model 727 airplanes equipped with an auxiliary fuel tank having a fuel pump installed. This AD requires revising the airplane flight manual to include limitations on operating the fuel pumps for the auxiliary fuel tank. This AD is prompted by a design review of the fuel pump installation, which revealed a potential unsafe condition related to the auxiliary fuel tank(s). We are issuing this AD to prevent dry operation of the fuel pumps for the auxiliary fuel tank, which could create a potential ignition source inside the auxiliary fuel tank that could result in a fire or explosion of the auxiliary fuel tank.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/06/30/05-12844/airworthiness-directives-boeing-model-727-airplanes-equipped-with-an-auxiliary-fuel-tank-having-a)
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